Jar-closure.



c. HAMMER.

JAR CLOSURE. APPLICATION FILED APR. 25. 1 917.

Patented Mar. 20, 1918.

2% his (lttozu C s TNT FM) CHARLES HAMMER, 0F QUEENS, NEW YORK, ASSIGNOR, BY DIRECT AND MESNE ASSIGN- MENTS, T0 AMERICAN METAL CAP ('30., 0F BROOKLYN, NEW YORK.

JAR-CLOSURE.

Specification of Letters Patent.

Patented Mar. 26, 1918.

Application filed April 25, 1917. Serial No. 164,356.

To all whom it may concern:

Be it known that 1, CHARLES HAMMER, a citizen of the United States, residing at Queens, in the county of Queens and State of New York, have invented certain new and useful Improvements in J ar-Closures, of which the following is a specification.

This invention relates to closures for storage vessels such as jars and bottles that have screw-threads or other form of lugs on the outer portion of the bottle neck, which closures are provided with inwardly proj ecting portions adapted to engage such lugs to secure the closure on the top of the bottle by screwing it down.

The object of the present invent-ion is to provide a form of lug in the inside wall of the cap flange by bending upwardly integral projections on the flange; and which form of closure will provide strong lugs to engage the jar threads over a considerable-surface, to insure a secure fastening means when the cap is screwed down. A. further object is to provide such a form of closure wherein the lugs are arranged wholly on the inner wall of the flange without deflection or any changebeing made in the cylindrical wall of the flange; and which arrangement has the further advantage that the lower edge or margin of the flange, especially on the outside, extends in a substantially unbroken or continuous course.

A further object of the invention is to provide" a form of the thread-engaging projection that is so disposed relative to the screw-thread on the bottle neck that the pitch of the threads in the two cooperating members are slightly different, whereby the projection will first engage with the thread on the bottle at the portion provided with the raw edge, and upon further application of the closure by screwing it down, the projection will slightly yield at the engaging portion to cause engagement throughout the extent of the pro ection with the bottle thread.

A further object is to provide in connection with the described form of cap, strengthening means extending around the flange adjacent the said projections, in the nature of a rib or corrugation.

.In the accompanying drawing showing one embodiment of my invention, Figure 1 is a vertical central section through the closure before the flange projections are bent to their final form. Fig. 2 is a similar view of the closure in the finished condition, with the threaded jar indicated and the cap screwed down. Fig. 3 is a bottom plan view of the closure. Fig. 1 is a fragmentary sec tion enlarged, taken on the line H of Fig.

3; and Fig. 5 is a fragmentary section enlarged, taken on the line 55 of Fig. 3.

As shown, the closure comprises a top portion 6, and a flange portion 7, that as shown is cylindrically formed. The lower edge of the flange is provided with a series of extensions 8, four of which are shown. These extensions as illustrated have the lower edge 9 inclined to the plane of the top 6, and all inclined in the same circular direction. These projections are bent back inwardly adjacent the inner face of the flange, preferably being given a sharp bend and pressed against the flange wall, as indicated at 10 in Figs. 4 and 5. The edge or margin of the projections are then bent toward the axis of the cylindrical flange, and preferably this bend 12 extends directly toward such axis, that is, radial lines from the edge to the axis would be perpendicular to the axis, and coincide with the bentedge.

By reason of the projection 8 having the lower edge 9 inclined to the top, the bent portion 12 is also inclined by being bent on a line 13 that is inclined to the top, or preferably somewhat curved. This bent portion '12 extends practically in a helical direction, and the upright bent portion 10 is pressed back against the cylindrical flange 7, and therefore will partake of its cylindrical contour. The edge of the upright portion, as defined by the line of bend 13, on which the bend 12 is made, will also partake of this cylindrical shape. This will cause the free edge 9 of the projection to extend in a curve, as seen in the plan View. This latter edge since it curves in two planes, is in the form of a helix.

The projecting edge 12 is also arranged relative to the screw-thread 14 on the jar 15, as indicated in Fig.2, whereby the screw pitch is slightly diflerent. This will cause engagement .of the lower edge at 16 between the bent edge of the lug and the jar thread first when the cap is applied As pressure is brought to screw the cap down, the bent edge of the lug will yield slightly and permit enthat the several projections 8 are bent upgagement throughout the length of the lug with the jar thread. This will increase the friction and make a somewhat better seal.

The flange 7 may also be provided with a reinforcement at its lower portion, shown in the nature of a corrugation or head 17. This serves to strengthen the cap at this portion, and resist bending of the cap when screwed on the jar. I

It will also be observed from the views ward on the inside in such a manner that the lower edge 18 of the flange extends in a substantially unbroken course, or in a continuous curve around the bottom of the flange. By this means any rough edges or the like are avoided, and the operator will not come in contact with sharp corners or edges that would have an injurious efi'ect. Having thus described my invention, what I claim is 1. A screw closure for a jar comprising a top and aflange having a plurality of independent projections on its lower edge, each projection being bent back inwardly to extend upward in acylindrical form incontact with the inner wall of the flange, with the edge of the projection bent to extend toward the axis of the cylindrical flange.

- 2. A screw closure for a jar comprising a top and a flange having a plurality of proections on its lower edge, each projection being bent back inwardl to extend upward in a cylindrical form a 011g the inner wall of the flange, with the edge of the projection bent substantially at right angles to extend toward the aXiS of the cylindrical flange, said bent edge being inclined to the plane of the top.

3. A screw closure for a jar comprising a top and a flange having a-plurality of projectlon on its lower edge, each projection having its lower free edge out on a bias and being bent back inwardly to extend upward in a cylindrical form parallel with the inner wall of the flange, with the edge of the projection bent on a line parallel to the biased free edge to extend toward the axis of the cylindrical flange, said bent edge being inclined to the plane of the top to form a helical surface to co-act with screw-threads on a jar neck.

4. A screw closure for a 'ar comprising a top and a flange having a plurality of projections on 1ts lower edge, each projection being bent back inwardly to extend upward in a cylindrical form along the inner wall of the flange, with the edge of the rojection bent inwardly on a line incline relative to the lower edge of the flange to extend toward the axis of the cylindrical flange, the

lower edge of the flange between and including the rojections extending in a substantially un roken course.

5. A screw closure for jars having closureengaging threads, comprising a top and a depending flange having inturned projections, the free edge portions of the projectionsbeing deflected to form a flat threadengaging face that is disposed at a lesser inclination than the threads of the jars.

6. A screw closure for a jar comprising a top and a flange having a plurality of projections on its lower edge, each projection being bent back inwardly to extend upward in a cylindrical form along the inner wall of the flange, with the edge of the projec tion cut on a bias and bent inwardly on a line. parallel with the bias to extend toward the axis of the cylindrical flange, said bent edge being inclined to the plane of the top in radial lines that vary in angular relation to said axis in a gradually increasing angle therewith.

7. A screw closure for a jar eomprisinga top and a flange havin a luralit of independent projections on its ower e ge, each projection being bent back inwardly to extend upward in a cylindrical form in con tact with the inner wall of the flange, with the edge of the projection bent to extend toward the axis of the cylindrical flange, the flange being provided opposite the edge of the aforesaid projection with an external corrugation extending around the lower portion in a continuous cylindrical form.

8. A screw closure for a jar comprising a top and a flange having a plurality of projections on its lower edge, each projection being bent back inwardly to extend upward in a cylindrical form alOng the inner wall of the flange, with the edge of the projection bent inwardly on a line inclined relative to the lower edge of the flange to extend to ward the axis of the cylindrical flange, the lower edge of the flange between and including-the projections extending in a substantially unbroken course, the flange being provided with an external corrugation extending around the lower portion in a continuous cylindrical form and in the plane of the projection edges to leave the latter unsupported. a

' CHARLES HAMMER. 

